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Try tapping/knocking on various parts of the TV to see it a bad solder joint is responsible. It could also be some component getting too hot or aged to the point of malfunction. Don't waste any money trying to fix this, rear projection TVs are dinosaurs.

Turn on the TV and grab the remote. In most cases, you will need the original remote to unlock the TV if you aren't sure of the unlock code. If you don't have the original remote, you will need to purchase one.2Look at the screen. If you see a blank screen with a red key on the bottom of the screen, press 'Function' and 'Mute' at the same time. This should unlock the channel. This is an option for people who want the TV to stay locked but, want to be able to bypass the lock to watch a certain show or channel. All other channels will remain locked and the TV will fully lock when it is turned off.3Unlock all of the channels on the TV by entering the factory reset code. There are three main reset codes that TV manufacturers set. These are 0711, 6688 and 3308. Try each one until you find the one that works. This will reset the TV to original factory settings. When you do this, you will loose any information that you have stored in the TV, such as favorite channels, automatic timers and the clock. You will have to go through the full initial set up.4Call the technical support service number in your owner's manual if none of those codes work. A technician can help you troubleshoot the television because the problem may not be the locking control. When you call, make sure that you have the model number and serial number of the TV.5Take your television to a TV repair shop. In some cases, a professional who access to wiring diagrams for your television set may have to rewire certain components in order for the television to unlock. This is usually the case when the TV locks by itself while it is on.

Also note that forgotten the passcode of your Mitsubishi TV. You can make it alive without knowing the passcode. Please followV_Chip lock bypassing prodedure is as followsYou can view your locked TV, cancel the lock, or enter the V_chip lock menus.

This is done by pressing the number "9" and "QV" buttons on the remote TV control at the same time, when your passcode is requested. This process temporarily unlocks the TV. When entering the V_Chip lock menu, this process deletes your old passcode and prompts you to enter a new passcode.

If you forget your pass code, you can view the locked
TV without entering your pass code. When you are
prompted for your pass code, press the number 9 and QV
buttons on the TV remote control at the same time. This
process temporarily unlocks the TV
When entering the Parental Lock menu, this process
deletes your old pass code and prompts you to enter a
new pass code. Press EXIT to exit the menu.

hello try this
Bypassing the V-Chip Lock
After you set the lock, you need your
passcode to view a V-Chip locked program,
view the locked TV, cancel the lock, or enter
the V-Chip lock menus.
If you forget your passcode, you can
view the locked TV without entering your
passcode. This is done by pressing the
number 9 and QV buttons on the remote
TV control at the same time, when your
password is requested. This process
temporarily unlocks the TV.
When entering the V-Chip Lock menu, this
process deletes your old passcode and
prompts you to enter a new passcode. good luck

Best thing to do is to buy a universal remote - preferably RCA/GE brand since it will work without programming.
You should also be able to get to the autoprogram function of the TV by using the front panel buttons.

Depending on the model you should look for the menu button. It should located on the side panel or on the front of the set. After pressing the menu you can use the volume and channel up down buttons to navigate to the setup area. Here you can add or delete channels.

The easiest will be to make sure that the cable box is on and sending out a signal to Channel 3 and auto-programming the set. Channel 3 is skipped because the last time it was auto-programmed, there was no signal on that channel.